diff --git a/src/IdentityInterface.php b/src/IdentityInterface.php
index 09922be0..48af6e1d 100644
--- a/src/IdentityInterface.php
+++ b/src/IdentityInterface.php
@@ -21,7 +21,7 @@
 /**
  * Identity interface
  *
- * @template-extends \ArrayAccess<int, \Authentication\IdentityInterface>
+ * @template-extends \ArrayAccess<array-key, \Authentication\IdentityInterface>
  */
 interface IdentityInterface extends ArrayAccess
 {